Reorganize net/disk_cache into backend specific directories.

net/disk_cache/blockfile/backend_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
-#ifndef NET_DISK_CACHE_BACKEND_IMPL_H_
-#define NET_DISK_CACHE_BACKEND_IMPL_H_
+#ifndef NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_
+#define NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_
 
 #include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/timer/timer.h"
-#include "net/disk_cache/block_files.h"
+#include "net/disk_cache/blockfile/block_files.h"
+#include "net/disk_cache/blockfile/eviction.h"
+#include "net/disk_cache/blockfile/in_flight_backend_io.h"
+#include "net/disk_cache/blockfile/rankings.h"
+#include "net/disk_cache/blockfile/stats.h"
+#include "net/disk_cache/blockfile/stress_support.h"
+#include "net/disk_cache/blockfile/trace.h"
 #include "net/disk_cache/disk_cache.h"
-#include "net/disk_cache/eviction.h"
-#include "net/disk_cache/in_flight_backend_io.h"
-#include "net/disk_cache/rankings.h"
-#include "net/disk_cache/stats.h"
-#include "net/disk_cache/stress_support.h"
-#include "net/disk_cache/trace.h"
 
 namespace net {
 class NetLog;
 }  // namespace net
 
 namespace disk_cache {
 
 struct Index;
 
 enum BackendFlags {
@@ skipping 359 matching lines @@
   scoped_ptr<base::RepeatingTimer<BackendImpl> > timer_;  // Usage timer.
   base::WaitableEvent done_;  // Signals the end of background work.
   scoped_refptr<TraceObject> trace_object_;  // Initializes internal tracing.
   base::WeakPtrFactory<BackendImpl> ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackendImpl);
 };
 
 }  // namespace disk_cache
 
-#endif  // NET_DISK_CACHE_BACKEND_IMPL_H_
+#endif  // NET_DISK_CACHE_BLOCKFILE_BACKEND_IMPL_H_